Turolla group 3 gear pumps - technical information - bibus sk

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OpenCircuitGear MEMBER OF THE SAUER-DANFOSS GROUP Group 3 Gear Pumps Technical Information System Requirements Pressure The inlet vacuum must be controlled in order to realize expected pump life and performance. The system design must meet inlet pressure requirements during all modes of operation. Expect lower inlet pressures during cold start. It should improve quickly as the fluid warms. Peak pressure is the highest intermittent pressure allowed. The relief valve overshoot (reaction time) determines peak pressure. It is assumed to occur for less than 100 ms. The illustration to the right shows peak pressure in relation to rated pressure and reaction time (100 ms maximum). Rated pressure is the average, regularly occurring, operating pressure that should yield satisfactory product life. The maximum machine load demand determines rated pressure. For all systems, the load should move below this pressure. Inlet pressure Max. continuous vacuum 0.8 [23.6] bar abs. Max. intermittent vacuum 0.6 [17.7] [in. Hg] Max. pressure 3.0 [88.5] Time versus pressure Pressure Peak pressure Rated pressure Reaction time (100 ms max) Time System pressure is the differential of pressure between the outlet and inlet ports. It is a dominant operating variable affecting hydraulic unit life. High system pressure, resulting from high load, reduces expected life. System pressure must remain at, or below, rated pressure during normal operation to achieve expected life. Speed Maximum speed is the limit recommended by Turolla OCG for a particular gear pump when operating at rated pressure. It is the highest speed at which normal life can be expected. Speed versus pressure Rated The lower limit of operating speed is the minimum speed. It is the lowest speed at which normal life can be expected. The minimum speed increases as operating pressure increases. When operating under higher pressures, a higher minimum speed must be maintained, as illustrated to the right. Pressure P 1 0 N1 N 2 Speed Where: N 1 = Minimum speed at 100 bar N 2 = Minimum speed at 180 bar Operating envelope Max 10 L1016456 • June 2010 • Rev A
OpenCircuitGear MEMBER OF THE SAUER-DANFOSS GROUP Group 3 Gear Pumps Technical Information System Requirements Hydraulic fluids Ratings and data for SNP3NN and SEP3NN gear pumps are based on operating with premium hydraulic fluids containing oxidation, rust, and foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear, erosion, and corrosion of internal components. They include: • Hydraulic fluids following DIN 51524, part 2 (HLP) and part 3 (HVLP) specifications • API CD engine oils conforming to SAE J183 • M2C33F or G automatic transmission fluids • Certain agricultural tractor fluids Use only clean fluid in the pump and hydraulic circuit. C Caution Never mix hydraulic fluids. Please see Turolla OCG publication Hydraulic Fluids and Lubricants Technical Information, L1021414 for more information. Refer to publication Experience with Biodegradable Hydraulic Fluids Technical Information, L1021903 for information relating to biodegradable fluids. Temperature and Viscosity Temperature and viscosity requirements must be concurrently satisfied. Use petroleum / mineral-based fluids. High temperature limits apply at the inlet port to the pump. The pump should run at or below the maximum continuous temperature. The peak temperature is based on material properties. Don’t exceed it. Cold oil, generally, doesn’t affect the durability of pump components. It may affect the ability of oil to flow and transmit power. For this reason, keep the temperature at 16 °C [60 °F] above the pour point of the hydraulic fluid. Minimum (cold start) temperature relates to the physical properties of component materials. Minimum viscosity occurs only during brief occasions of maximum ambient temperature and severe duty cycle operation. You will encounter maximum viscosity only at cold start. During this condition, limit speeds until the system warms up. Size heat exchangers to keep the fluid within these limits. Test regularly to verify that these temperatures and viscosity limits aren’t exceeded. For maximum unit efficiency and bearing life, keep the fluid viscosity in the recommended viscosity range. Fluid viscosity Maximum (cold start) 1000 [4600] mm 2 /s Recommended range 12-60 [66-290] [SUS] Minimum 10 [60] Temperature Minimum (cold start) -20 [-4] °C Maximum continuous 80 [176] [°F] Peak (intermittent) 90 [194] L1016456 • June 2010 • Rev A 11
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